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From Carmen Manzulli <carmenmanzu...@gmail.com>
Subject Re: Couldn't instantiate
Date Wed, 02 Jul 2014 10:50:01 GMT
ok; i've done what you have told me...but now i've got this problem..

ava.lang.Throwable: Child Error
	at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Task process exit with nonzero status of 1.
	at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:258)

this is my Computation code:
import org.apache.giraph.GiraphRunner;
import org.apache.giraph.graph.BasicComputation;
import org.apache.giraph.graph.Vertex;
import org.apache.giraph.edge.Edge;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.util.ToolRunner;



public class SimpleSelectionComputation extends
BasicComputation<Text,NullWritable,Text,NullWritable> {
	
@Override
public void compute(Vertex<Text,NullWritable,Text>
vertex,Iterable<NullWritable> messages){
	
	
	Text source = new Text("http://dbpedia.org/resource/1040s");
	
	if (getSuperstep()==0)
	{
		if(vertex.getId()==source)
		{
			System.out.println("il soggetto "+vertex.getId()+" ha i seguenti
predicati e oggetti:");
			for(Edge<Text,Text> e : vertex.getEdges())
			{
				System.out.println(e.getValue()+"\t"+e.getTargetVertexId());
			}
		}
		vertex.voteToHalt();
	}
	
}

public static void main(String[] args) throws Exception {
    System.exit(ToolRunner.run(new GiraphRunner(), args));
  }

	
}

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